Abstract
Since valley was introduced into phononic crystals, it has promoted far-reaching developments in topologically protected acoustic transmission. However, in the novel research field of valley-Hall phononic topological insulators, most researchers only focus on valley-protected edge state with a single working frequency band. Here, we demonstrate dual-band valley-protected topological edge states in a graphene-like two-dimensional phononic crystal, which consists of columnar air cavities and rigid scatters. It is demonstrated that energy band inversion happens and a gap can be opened at the two Dirac cones at the K (K') symmetry points of the Brillouin zone by tuning the radius differences between adjacent columnar air cavities. In addition, we demonstrate the presence of dual-band topologically protected edge states with properties like suppressed back-scattering, one-way transmission, and sharp bend resistance. In these contexts, beam splitting with dual-band is achieved by combining valley vortex states with opposite chirality. Our work may provide a practical method for solving high-efficiency and high-capacity multi-channel acoustic communication in fluid media.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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National Natural Science Foundation of China (61775050, 11804073).
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Conceptualization: Qianlong kang, Hongyong mao; Methodology: Qianlong kang, Fujia Chen, Hongyong mao; Formal analysis and investigation: Keya Zhou, Kai Guo, Shutian Liu, Zhongyi Guo; Writing—original draft preparation: Qianlong kang; Writing—review and editing: Keya Zhou, Kai Guo, Shutian Liu, Zhongyi Guo; Funding acquisition: Zhongyi Guo; Supervision: Zhongyi Guo.
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Kang, Q., Chen, F., Mao, H. et al. Dual-band valley-protected topological edge states in graphene-like phononic crystals with waveguide. Eur. Phys. J. B 96, 40 (2023). https://doi.org/10.1140/epjb/s10051-023-00503-4
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DOI: https://doi.org/10.1140/epjb/s10051-023-00503-4